Tips for warming up Rotel + B&W system?

Wow, different strokes! B&W is usually a good match for the warmer Rotel gear. May I suggest that you hook up one of the speakers out of phase and position the speakers very close to one another with the front (driver sides) facing one another. Let the music play all day, as many days as necessary. The speakers being out of phase will allow you to play them much louder without disturbing anyone. The synthetics that are used in modern spiders and surrounds really take quite a bit more time to break in, as well as some of the modern caps. Don't give up the ship before you get out of the bay!

Thanks to all for your suggestions...

Do you have any power conditioning, upgraded powercords? It has made an unblievable difference for me. If you liked this combo in the store, then the main issues to look at would be, as others pointed out, the room, break in, and the quality of the electricity the amp and player are receiving.

Get a smooth, warmish fairly high quality interconnect like Music Metre Signature, Harmonic Tech Truthlink, or Luminous Synchestra Sig.

i also heard no bass in any b&w setups.
anything but bass even in the most expencive 'reference' models.

you could move them closer to the wall and you will reinforce mid-bass this way. the lower bass will still be shy.